Friday, January 4, 2008

Cmoy amplifier is currently the most popular headphone amplifier for beginner to DIY. It only use a 9v battery to drive this headphone amplifier, and it sound excellent! The complete headphone amplifier it self is very small, you could pack the circuit board & battery into a candy tint which is portable to carry around with your ipod or any portable mp3 player. To diy this cmoy headphone amplifier is extremely easy and simple, it only take less then a day to complete.

A step by step guide to build a headphone amplifier.It sound wonder with Ipod.

Ok I am not gonna crap here, Let's start straight to the point.

The Tools

The Cmoy Headphone Amplifier Component Parts 1

The Cmoy Headphone Amplifier Component Parts 2A Picture say a thousand words, As stated very clearly that what are the component needed for this Cmoy amplifier. Print and bring this out with you when you go to the radio shack to get this component.

Assembly The Cmoy Headphone Amplifier

Step 1Get ready your PCB Board.

Step 2Mark out the center ground.

Step 3Solder the battery clip wire on to the PCB board as shown above.

Step 4Solder the Power Led onto the board as shown above.Add R6 Resistor 10k Ohm as shown above.

Step 5As you can see on the picture above, the green line indicate that we have to solder and connect hole 4 to 5 to 6. On the other side we have to solder hole 9 to 10 to 11.____________________________________*NOTE: How to solder the green line?There is 2 type of joining the green line, for beginner I will suggest you to use type "A".Type "B" need more stable hand but less of trouble to cut the left over wire from resistor or capacitor.___________________________

Once you have done up to step 5, you should test your circuit by connect it to a 9v battery and toggle on the switch, the led should be light you by now. If you can't get the led to work, please go back to STEP 4, Reverse your Power Led connection and test again.

Slumber the part is least then $25. I got all my part from SLT accept the "IC" Blurr brown opa2227 which I order online from U.S and they mail it to me. As for your qns on how to place the circuit board into the tin, alright the circuit board itself is rather small so you can actually put inside but do cut out a pcs of paper to put underneath the board in order not to short circuit the board by the tins... for the switch and Left/Right Input and output, I use a Single Hole paper puncher to punch a hole onto the tins so that i can screw all the component onto it... Hope this help you! Cheers!

You could get the schmatic at http://diy4fun.blogspot.com/2007/11/cmoy_11.html

As for the tweaking, you could buy some great capacitor and resistor shown on this forum http://www.hometheatershack.com/forums/home-theater-audio-video-news/2375-you-cannot-afford-audiophile-grade-cmoy-headphone-amplifier.html

Great tutorial. The visuals of the circuit board are great. If I may add though, the 10k pot is an optional part, as the amp will be fine on it's own without it, since the original design didn't have one.

Well anonymous your this comment should be post at Grado RA1 session, "Thank you bro!!! I followed your tutorial and manage to build 1 myself..since then ive tested a couple and tweak some of it.......

But...still quite blur when tried to combine tle2426 in the original circuit by you..little help please?"

Tkx a lot for the link..Just wanted to ask a quick question..I used a 220 muF 35V capacitor, instead of the 16V that you mentioned..When I built the amp (with the TLE2426), the bass is weak (while other instruments sound kinda OK)..I guess the bass is normally more crunchy (I had built a couple of CMoy's earlier)..Could it be because of using the wrong capacitor? I am driving the amp thru' a 9V DC wall wart adaptor..

atul, for the caps at 35v is fine, that is only the indication of how much voltage can the caps tolerate before it explode. As i think your main DC supply is 9V DC I think a 35v is a waste, suggest a 16v cap will do the job. Or if u have the intention to use a 18V then get a cap of 25V, as long your caps voltage is larger then your power suppy DC Voltage will do.

For bass output we require higher uf from the caps. As 220uf is more then enough to hold the current, you can try using higher value like 470uf to hold even more current.

I changed the caps at the power suppl end to 470 uF but bass still sounds weak..I guess the prob cud be elsewhere like bad soldering :(( There cud be one more thing. Do u think changing the caps in the audio part from 01.1uF to 1uF might fix the weak bass prob?

early on you were saying that u had build a couple cmoy sometime ago which you don't have the problem with your current headphone. May i ask few qns, are you using the same gain @11 for your previous cmoy? do you also use a tle 2426 for ur previous cmoy? ok why am i asking this qns becoz, reason might be the gain level try change ur gain to 6 by change R3 to 2k ohm. as for ur info tle2426 max current is about 50-60ma so is pretty low as i can say, other wise you may one try to use the standard Power supply instead of Virtual Gnd.

hi neo, My earlier CMoy's followed the same circuit as shown in tangent's website. So the gain was always 11. But the prob with that design is that it becomes unbalanced after some time. Hence I was looking arnd for a circuit which has a better supply part and that is when I chanced upon ur website. I had heard that the TLE2426 performs better than the standard CMoy power supply as shown in the tangent website. This is my first attempt with the TLE. For your info I am using a Grado headphone with this. I will try out your suggestion about changing the gain and see how it goes..

hi.. i'm rachel. i've try this out, but i cant get an expected result.. the sound is vy soft.. do u hav any suggestion to improved this circuit or i should add anything else?u may email me or add me at msn messenger. my email is ngyting@hotmail.comthanks.

Can you show the back of a completed amp? I am unsure from the 'follow the green line' if there is just one piece of metal wire soldered at two end points, or of its laid on the board and soldered to the board.

I am a new to the world of electronics, and I was wondering if this amp could power 2 4inch speakers at 8ohms and 2 watts each. Or maby some .5v 1inch 8ohm speakers? I would also like to know exactly how it works, do you just plug in your input signal via 3.5mm jack, and then plug the speakers into the output? What does the pot do? How long does the battery last, and is it possibal to run it off of a few AA batteries instead of a 9v? Thank you for all of your help, if you could e-mail me detailed responses at yeoj2131@hotmail.com I would much appreciate it. Thanks again!

how would you wire it if you were to remove the power switch and just have the unit turn on when you plug something in the input? something like how active guitar pickups turn on when you plug in a cable. i know it's possible but i just don't know how to do it.

it's just a little mod i'd like to do when i try to build this.thanks!

Thanks for this great tutorial. I've made some changes: I used 470uF capacitors (instead of 220u) this made a big improvement in bass and I used a diferent opamp, AD712JN, and it works very good in this design.Thanks for all.Rui

Special thanks for the blog :) Even a beginer like me make it for only 6 hours. The sound is prety much ok , but to noise level is a bit high ( I mean the noise of the Cmoy itself). Btw I am using 2 9V batteries in parallel.

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Great tutorial! I have a cmoy that I built years ago, and today I biased it into class-A. The sound is much better, all I did was p2p solder two 1N5308 (Central Semiconductor) directly on my OPA2227 (Pin 1 -> 4 and Pin 7 -> 4). This simple modification biases the opamp into Class A using the best technique The JFET Cascode

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Great tutorial. The visuals of the circuit board are great. If I may add though, the 10k pot is an optional part, as the amp will be fine on it's own without it, since the original design didn't have one.

They may be omitted in most cases. They are needed only when the input signal has a direct voltage component (ie, direct coupled single ended transistor stage without an output capacitor). You can try building one without the input capacitors, and then put them in if the output seems to clip. The low frequency response will be better without them in circuit.

You done some nice modification in to the original Cmoy circuit but I recommend to use some different kind of power source cos' capacitor-voltage divider has one problem, it gets very easily unbalanced and that means that the positive and negative voltage goes uneven and the virtual ground starts to swing around which can causes problems when battery voltage is dropping.

I want to get the most out of my Shure audio SRH750DJ headphones. Is this the right circuit and opamp chip combination to be using?

my iphone isnt giving me the loudness that i would expect from these. thats why i want to make the amp. what chip would best suit these headphones? and what would have to be changed in the circuit for the chip to function correctly?

Wow, thanks for putting this tutorial up for us. I've assembled one for a digital recording studio. It's almost finished, I only need a battery connector and the correct opamp (ordered and on the way). I wonder about the power consumption though. Does it really need a 9 volt battery? I was thinking about trying to find a li/ion cell I could rig up to use usb charging. What kind of battery life do you experience with these units btw?

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First time I heard this amazing "Headphone Amp" before I don't know about this. If this Headphone Amp is popular nowadays, why people doesn't spreading word over Google and other platform like blogs and forums. I don't understand that.

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Hi, I just finished a cmoy according to this tutorial, but sadly, it doesn't work. Do u think that using TL072 IC could be a problem? Or can a low battery cause that no sound at all is heard in the headphones? Because all the wiring should be OK, I hope. Thanks for reply

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Williamneo.blogspot.com is dedicated to all enthusiasts who are interested in D.I.Y headphone amplifier but are clueless on how to begin with the complicated formulas and diagrams on books and websites.

This website will simplify all the complicated steps and explain the formulas and components. Furthermore, tutorials that share the process of doing the electronics step by step will be provided.

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